Honestly, my issue with Rey is her level of power and proficiency solely through instinct. Unless she really is Anakin reborn to atone for his sins, she just feels... like she's on the Jedi Council before earning the rank of Master

Alone she drifts from ancient mists
Nary a candle, nary a wish
But in the wont of wandering paths
Through wooded knolls, and windworn crags
She seeks a face she thought as friend
But now -- she thinks as judgement's end

It never says she's a good pilot and knows what a hiperdrive is purely on instinct. She's been scavenging ships all her life, and at some point, built a flying simulator, it's in the book I mentioned. Not all of her skills come with instinct and she obviously had to learn how to fight to survive, as she was abandoned very young. She can understand wookie, but we are never told if there are or aren't wookies on Jakku. I get people who don't like Rey and can respect that, bc that's purely a matter of opinion. But putting the label of Mary Sue on her using arguments that are not valid just pisses me off.